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Investment Securities - Securities with gross unrealized losses (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019 | Sep. 30, 2019
--- | --- | --- | ---
Securities Available for Sale, Gross Unrealized Losses |  |  |
Less Than Twelve Months | $ 3,097 | $ 3,186 | $ 1,156
Twelve Months or More | 1,090 | 1,353 | 1,375
Securities Available for Sale, Fair Value |  |  |
Less Than Twelve Months | 741,122 | 503,728 | 317,961
Twelve Months or More | 110,312 | 141,982 | 154,111
State and municipal obligations |  |  |
Securities Available for Sale, Gross Unrealized Losses |  |  |
Less Than Twelve Months | 109 | 764 | 43
Securities Available for Sale, Fair Value |  |  |
Less Than Twelve Months | 43,880 | 42,070 | 5,275
Mortgage-backed securities |  |  |
Securities Available for Sale, Gross Unrealized Losses |  |  |
Less Than Twelve Months | 2,988 | 2,422 | 1,113
Twelve Months or More | 1,090 | 1,353 | 1,375
Securities Available for Sale, Fair Value |  |  |
Less Than Twelve Months | 697,242 | 461,658 | 312,686
Twelve Months or More | $ 110,312 | $ 141,982 | $ 154,111

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